A heat moisture exchanger becomes clogged in a ventilator circuit. What should the specialist do?

• A. Rinse the HME with water
• B. Replace it with a new HME
• C. Increase the temperature setting on the HME
• D. Replace it with a wick humidifier

Answer: (D)

When a heat moisture exchanger in a ventilator circuit becomes clogged, the priority is to restore reliable humidification and minimize airway resistance. An HME is a passive device that relies on a clean surface to transfer heat and moisture from exhaled gas to inhaled gas; once secretions block it, effective humidification drops and resistance can increase. Replacing the clogged HME with an active humidification system, such as a wick humidifier, reliably delivers heated, humidified gas to the airway. Rinsing with water isn’t dependable and can introduce contamination or fail to clear the blockage. Simply increasing the temperature won’t fix a physical clog and may cause condensation issues. A wick humidifier provides controlled, heated humidity and is appropriate as a substitute in this situation.